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1、英文原文英文原文ExperimentalanalysisofacompositeautomotivesuspensionarmM.PINFOLDG.CALVERT“(UniversityofWarwickRoverGroupGaydonUK)Received11November1992revised26March1993Inapplicationswhereweightsavingpartsintegrationcanbeachieve
2、dtheRoverGrouphasbeeninvestigatingthedesignmanufactureofcomponentsfromcompositematerials.Themethodsusedinthedifferentstepsinthedesigntomanufacturecycleinthehighvolumeautomotiveindustryarerelativelywellknownfasteelcompone
3、ntbutarenotsowellestablishedfacompositecomponent.Adesignmethodologyfcompositeshasbeenemerginginwhichaprincipalprocedureisdesignanalysis.Oneofthemostestablishedmethodsofanalysisisthatusingthefiniteelementtechniquethisisbe
4、ingsupplementedwithexperimentaltestsonprototypesusingphotoelasticanalysisstresspatternanalysisbythermalemissioncoupledwithconventionalstraingaugemoniting.Littlewkhasbeenundertakentocrelatetheresultsobtainedfromthesediffe
5、renttestmethodstocomparetheresultswithmeasurementsmadeonanactualcomponent.Thispaperpresentssomeofthewkundertakenconcerningtheanalysistestingofacompositeautomotivesuspensionarm.Theresultsobtainedfromthethreedifferentanaly
6、sistechniquesarecomparedwithexperimentaltestresultstheiraccuracyisdiscussed.Keywords:autmotivesuspensionarmstressanalysisfiniteelementmethodphotoelasticanalysisSPATEstraingaugessheetmouldingcompoundSoldeWilde~statethatco
7、mpositematerialshavebeenusedincreasinglyasstructuralmaterials.Areasonfthis..isthatcompositematerialshavehighstrengthtoweighthighstiffnesstoweightratioswhichcansignificantlyreducetheweightofastructure...Perhapsthemostimpt
8、antfeatureofcompositematerialsisthattheirmechanicalp~:opertiescanbe“tailed“tomeetaspecificcriterion.HoweverJohnsonetalsuggestthatcompositedesignanalysisfabricationtechnologymustundergomajdevelopmentssuccessfuldemonstrati
9、onsbefesignificantstructuralcomponentswillbeincpatedinproductionautomobilespositematerialshavetocompetewithsteelwithintheengineeringenvironment.Withintheautomotiveindustrythisrequiresacertainamountoftechnologytransferfro
10、mplacessuchastheAdvancedTechnologyCentreattheUniversityofWarwickwhichwkwithmaterialmanufacturersautomotiveengineerstoenableunderstingaboutthesematerialsasanalternativetothetraditionalmaterialssuchassteel.Ifcompositesaret
11、ocompetewithtraditionalmaterialsinarealsensethenautomotivedesignersneedtobefullyawareoftheirstrengthscompound.TherefefiatplatesbeamsdiscsconstructedfromSMCwereanalysedundervariousloadingconditionsbefeprogressingontothede
12、signedcomponent.Mostvalidationtestswerecarriedoutusingstraingaugedspecimenstocrelatewiththefiniteelementanalysisresults.AlthoughitisrecognizedthatSMCisnotanisotropiematerialduetosomefibreientationduringprocessingfthepurp
13、osesofanalysisthematerialwasassumedtobeisotropic.AlsowhentheactualSMCsuspensionarmwascutupexaminedsignificantfibredistributionwasobservedintheribs.Itisfeltthatthecrelationbetweentheexperimentalanalysisresultsvalidatedthi
14、sassumptioninthecaseofthisparticularcomponent.StraingaugetestsBefeundertakingtheexperimentaltestwkthecompositecomponentwasmountedviaitsrubbermountingbushesontoarelativelyinfinitelystiffstructure.Itisverydifficulttocovera
15、lloftheloadingconditionswhenconductingexperimentalteststhusawstcasescenarioisusuallyassumed.Thewstcaseloadingconditiononsuspensioncomponentsisknownaspotholebrake.Thisattemptstosimulatethevehiclefallingintoadeeppotholeat3
16、0mphwiththebrakesfullyappliedatthepointofimpact.Theresultantfeaftlateralloadsarethencalculatedbasedontheweightvelocityofthevehicle.Duetothelimitationsofthetestrigthefullpotholeloadscouldnotbeappliedtothecomponentthusredu
17、cedloadswiththesameresultantdirectionasthepotholeloadswereappliedtheresultsscaled.Theloadsappliedfthefullpotholebrakecasewere24.2kNinX8.2kNin“Yfthereducedloadcasewere5.9kNinX2.02kNinYseeFig.1.Thestraingaugesusedconsisted
18、ofsixthreeaxisrosettegauges13singlegridgaugeswith2.5mmgridlengthschosentofitintotheradiiofthecomponentinanattempttomeasurethemaximumstrainGaugesweresituatedneartheballjointhousingwheretheloadswereappliedaroundtheradiioft
19、hebodymountingbusheswherethecomponentwouldbemountedtothecarsubframe.Additionalstraingaugesweresituatedonsomeofthestrengtheningribsclosetotheantirollbarmountingposition.SPATEanalysisStresspatternanalysisbythermalemission(
20、SPATE)canbeusedtodeterminethesurfacestressesofcomponentsbystudyingthesmallchangesintemperatureduetocyclicloadingconditions.SPATEequipmentcomprisesadetectunitwithscanningheadananaloguesignalprocessingunitadigitalelectroni
21、cdataunit.Thesystemwksbydetectingtheminutetemperaturechangeswhichoccurwhenastructureiscyclicallyloaded.Theinfrareddetectscansthestructurecrelatesthemeasuredoutputwithareferencesignalfromtheloadingsystem.Anelectronicdatap
22、rocessingsystemcrelatesthedetectedstressinducedthermalfluctuationswiththeloadingreferencesignal.Acolourcontourmapofthesumoftheprincipalstresses(cr~4)isthenplottedtogetherwithabartgivingactualvalues.Thiscrelationofsignals
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